wedge alsi wool are ceramic fiber bulks are made of high purity high purity composite raw materials, melted in the resistance furnaces and processed by blowing or spinning technology. features & benefits • high thermal shock resistance • excellent thermal stability • low thermal conductivity • low heat storage • high temperature resistance applications • raw materials for ceramic fiber blanket & boards. • as joint filling materials in insulation installation. • packing expansion joints • fire resistant doors making as filler • kiln car filling .